//模板
<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录表单区 -->
            <el-form 
            :model="loginForm" 
            label-width="0px" 
            class="login_form" 
            :rules="loginFormRules"
            ref="loginFormRef"
            >
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password"></el-input>
                </el-form-item>
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

//行为
<script>
    export default {
        data() {
            return {
                loginForm: {
                    username:'admin',
                    password:'123456'
                },
                loginFormRules:{
                    username:[
                        { required: true, message: '请输入用户名', trigger: 'blur' },
                    ],
                    password:[
                        { required: true, message: '请输入密码', trigger: 'blur' },
                        { min: 6, max: 10, message: '长度在 5 到 10 个字符', trigger: 'blur' }
                    ]
                }
            }
        },
        methods: {
            // 点击重置按钮，重置登录表单
            resetLoginForm() {
                console.log(this);
                this.$refs.loginFormRef.resetFields()
                
            },
            // 登录表单预验证
            login(){
                this.$refs.loginFormRef.validate( async valid => {
                    if(!valid) return;
                    const {data: res} = await this.$http.post("login",this.loginForm)
                    if(res.meta.status !== 200){
                        this.$message.error("登陆失败")
                    }else{
                        this.$message.success("登录成功")
                        // 1、将登陆成功之后的token, 保存到客户端的sessionStorage中; localStorage中是持久化的保存
                            // 1.1 项目中出现了登录之外的其他API接口，必须在登陆之后才能访问
                            // 1.2 token 只应在当前网站打开期间生效，所以将token保存在sessionStorage中
                            window.sessionStorage.setItem("token",res.data.token)
                        // 2、通过编程式导航跳转到后台主页, 路由地址为：/home
                            this.$router.push("/home")
                    }
                })
            }
        },
    }
</script>
//样式
<style lang="less" scoped>
.login_container{
    background-color: #2b4b6b;
    height: 100%;
}
.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}
// 头像
.avatar_box{
    width: 130px;
    height: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: #fff;
    img{
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
    }
}
// 按钮
.btns{
    display: flex;
    justify-content: flex-end;
}
.login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
</style>